<template>
  <div class="wrapper" ref="wrapper">
    <div class="">
      <slot></slot>
    </div>
  </div>
</template>

<script>
import BScroll from "better-scroll";
import Pullup from "@better-scroll/pull-up"; //再引入 pulldown 插件
BScroll.use(Pullup);
export default {
  name: "Scroll",
  props: {
    probeType: {
      type: Number,
      default: 0
    },
    oullUpLoad: {
      type: Boolean,
      default: false
    }
  },
  data() {
    return {
      scroll: null
    };
  },
  mounted() {
    this.scroll = new BScroll(this.$refs.wrapper, {
      observeDOM: true,
      click: true,
      probeType: this.probeType,
      pullUpLoad: true
    });
    //监听滚动位置
    this.scroll.on("scroll", position => {
      this.$emit("scroll", position);
    });

    //监听上拉加载事件
    this.scroll.on("pullingUp", () => {
      this.$emit("pullingUp");
    });
  },
  methods: {
    scrollTo(x, y, time = 300) {
      this.scroll.scrollTo(x, y, time);
    },
    finishPullUp() {
      this.scroll.finishPullUp();
    },
    refresh(){
      //调用之前先判断是否有这个 this.scroll;其它时候也可以类似
      this.scroll&&this.scroll.refresh();
    },
    getScrollY(){
      return this.scroll?this.scroll.y:0
    }
  }
};
</script>

<style scoped>
.wrapper{
  z-index: 10;
}
</style>
